Mercurial > sdl-ios-xcode
annotate src/video/SDL_stretch.c @ 4541:abb56f7699ea SDL-1.2
Fixed bug 936
Make sure that eip doesn't overflow the copy buffer beforehand. :)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 18 Jul 2010 10:08:06 -0700 |
| parents | ab2dfac9d5c1 |
| children | d7cdc25af9a2 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 4159 | 3 Copyright (C) 1997-2009 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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Updated copyright information and removed rcs id lines (problematic in branch merges)
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
|
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15 You should have received a copy of the GNU Lesser General Public |
|
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16 License along with this library; if not, write to the Free Software |
|
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
|
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Updated the source with the correct e-mail address
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* This a stretch blit implementation based on ideas given to me by | |
| 25 Tomasz Cejner - thanks! :) | |
| 26 | |
| 27 April 27, 2000 - Sam Lantinga | |
| 28 */ | |
| 29 | |
| 30 #include "SDL_video.h" | |
| 31 #include "SDL_blit.h" | |
| 32 | |
| 33 /* This isn't ready for general consumption yet - it should be folded | |
| 34 into the general blitting mechanism. | |
| 35 */ | |
| 36 | |
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37 #if ((defined(_MFC_VER) && defined(_M_IX86)/* && !defined(_WIN32_WCE) still needed? */) || \ |
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Updated OS/2 build, yay!
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38 defined(__WATCOMC__) || \ |
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39 (defined(__GNUC__) && defined(__i386__))) && SDL_ASSEMBLY_ROUTINES |
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ab2dfac9d5c1
There's a bug with gcc 4.4.1 and -O2 where srcp doesn't get the correct value after the first scanline. Ugh.
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40 /* There's a bug with gcc 4.4.1 and -O2 where srcp doesn't get the correct |
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ab2dfac9d5c1
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41 * value after the first scanline. FIXME? */ |
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ab2dfac9d5c1
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42 /*#define USE_ASM_STRETCH*/ |
| 0 | 43 #endif |
| 44 | |
| 45 #ifdef USE_ASM_STRETCH | |
| 46 | |
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47 #ifdef HAVE_MPROTECT |
| 4108 | 48 #include <sys/types.h> |
| 49 #include <sys/mman.h> | |
| 50 #endif | |
|
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51 #ifdef __GNUC__ |
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52 #define PAGE_ALIGNED __attribute__((__aligned__(4096))) |
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53 #else |
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54 #define PAGE_ALIGNED |
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55 #endif |
| 4108 | 56 |
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57 #if defined(_M_IX86) || defined(i386) |
| 0 | 58 #define PREFIX16 0x66 |
| 59 #define STORE_BYTE 0xAA | |
| 60 #define STORE_WORD 0xAB | |
| 61 #define LOAD_BYTE 0xAC | |
| 62 #define LOAD_WORD 0xAD | |
| 63 #define RETURN 0xC3 | |
| 64 #else | |
| 65 #error Need assembly opcodes for this architecture | |
| 66 #endif | |
| 67 | |
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68 static unsigned char copy_row[4096] PAGE_ALIGNED; |
| 0 | 69 |
| 70 static int generate_rowbytes(int src_w, int dst_w, int bpp) | |
| 71 { | |
| 72 static struct { | |
| 73 int bpp; | |
| 74 int src_w; | |
| 75 int dst_w; | |
|
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76 int status; |
| 0 | 77 } last; |
| 78 | |
| 79 int i; | |
| 80 int pos, inc; | |
| 4541 | 81 unsigned char *eip, *end; |
| 0 | 82 unsigned char load, store; |
| 83 | |
| 84 /* See if we need to regenerate the copy buffer */ | |
| 85 if ( (src_w == last.src_w) && | |
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86 (dst_w == last.dst_w) && (bpp == last.bpp) ) { |
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87 return(last.status); |
| 0 | 88 } |
| 89 last.bpp = bpp; | |
| 90 last.src_w = src_w; | |
| 91 last.dst_w = dst_w; | |
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92 last.status = -1; |
| 0 | 93 |
| 94 switch (bpp) { | |
| 95 case 1: | |
| 96 load = LOAD_BYTE; | |
| 97 store = STORE_BYTE; | |
| 98 break; | |
| 99 case 2: | |
| 100 case 4: | |
| 101 load = LOAD_WORD; | |
| 102 store = STORE_WORD; | |
| 103 break; | |
| 104 default: | |
| 105 SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp); | |
| 106 return(-1); | |
| 107 } | |
| 4355 | 108 #ifdef HAVE_MPROTECT |
| 109 /* Make the code writeable */ | |
| 110 if ( mprotect(copy_row, sizeof(copy_row), PROT_READ|PROT_WRITE) < 0 ) { | |
| 111 SDL_SetError("Couldn't make copy buffer writeable"); | |
| 112 return(-1); | |
| 113 } | |
| 114 #endif | |
| 0 | 115 pos = 0x10000; |
| 116 inc = (src_w << 16) / dst_w; | |
| 117 eip = copy_row; | |
| 4541 | 118 end = copy_row+sizeof(copy_row); |
| 119 for ( i=0; i<dst_w && eip < end; ++i ) { | |
| 0 | 120 while ( pos >= 0x10000L ) { |
| 121 if ( bpp == 2 ) { | |
| 122 *eip++ = PREFIX16; | |
| 123 } | |
| 124 *eip++ = load; | |
| 125 pos -= 0x10000L; | |
| 126 } | |
| 127 if ( bpp == 2 ) { | |
| 128 *eip++ = PREFIX16; | |
| 129 } | |
| 130 *eip++ = store; | |
| 131 pos += inc; | |
| 132 } | |
| 133 *eip++ = RETURN; | |
| 134 | |
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135 /* Verify that we didn't overflow (too late!!!) */ |
| 4541 | 136 if ( i < dst_w ) { |
| 137 SDL_SetError("Copy buffer too small"); | |
| 0 | 138 return(-1); |
| 139 } | |
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140 #ifdef HAVE_MPROTECT |
| 4355 | 141 /* Make the code executable but not writeable */ |
| 142 if ( mprotect(copy_row, sizeof(copy_row), PROT_READ|PROT_EXEC) < 0 ) { | |
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143 SDL_SetError("Couldn't make copy buffer executable"); |
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144 return(-1); |
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145 } |
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146 #endif |
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147 last.status = 0; |
| 0 | 148 return(0); |
| 149 } | |
| 150 | |
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151 #endif /* USE_ASM_STRETCH */ |
| 0 | 152 |
| 153 #define DEFINE_COPY_ROW(name, type) \ | |
| 154 void name(type *src, int src_w, type *dst, int dst_w) \ | |
| 155 { \ | |
| 156 int i; \ | |
| 157 int pos, inc; \ | |
| 158 type pixel = 0; \ | |
| 159 \ | |
| 160 pos = 0x10000; \ | |
| 161 inc = (src_w << 16) / dst_w; \ | |
| 162 for ( i=dst_w; i>0; --i ) { \ | |
| 163 while ( pos >= 0x10000L ) { \ | |
| 164 pixel = *src++; \ | |
| 165 pos -= 0x10000L; \ | |
| 166 } \ | |
| 167 *dst++ = pixel; \ | |
| 168 pos += inc; \ | |
| 169 } \ | |
| 170 } | |
| 171 DEFINE_COPY_ROW(copy_row1, Uint8) | |
| 172 DEFINE_COPY_ROW(copy_row2, Uint16) | |
| 173 DEFINE_COPY_ROW(copy_row4, Uint32) | |
| 174 | |
| 175 /* The ASM code doesn't handle 24-bpp stretch blits */ | |
| 176 void copy_row3(Uint8 *src, int src_w, Uint8 *dst, int dst_w) | |
| 177 { | |
| 178 int i; | |
| 179 int pos, inc; | |
|
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180 Uint8 pixel[3] = { 0, 0, 0 }; |
| 0 | 181 |
| 182 pos = 0x10000; | |
| 183 inc = (src_w << 16) / dst_w; | |
| 184 for ( i=dst_w; i>0; --i ) { | |
| 185 while ( pos >= 0x10000L ) { | |
| 186 pixel[0] = *src++; | |
| 187 pixel[1] = *src++; | |
| 188 pixel[2] = *src++; | |
| 189 pos -= 0x10000L; | |
| 190 } | |
| 191 *dst++ = pixel[0]; | |
| 192 *dst++ = pixel[1]; | |
| 193 *dst++ = pixel[2]; | |
| 194 pos += inc; | |
| 195 } | |
| 196 } | |
| 197 | |
| 198 /* Perform a stretch blit between two surfaces of the same format. | |
| 199 NOTE: This function is not safe to call from multiple threads! | |
| 200 */ | |
| 201 int SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect, | |
| 202 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 203 { | |
|
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204 int src_locked; |
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205 int dst_locked; |
| 0 | 206 int pos, inc; |
| 207 int dst_width; | |
| 208 int dst_maxrow; | |
| 209 int src_row, dst_row; | |
| 210 Uint8 *srcp = NULL; | |
| 211 Uint8 *dstp; | |
| 212 SDL_Rect full_src; | |
| 213 SDL_Rect full_dst; | |
|
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214 #ifdef USE_ASM_STRETCH |
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215 SDL_bool use_asm = SDL_TRUE; |
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216 #ifdef __GNUC__ |
| 0 | 217 int u1, u2; |
| 218 #endif | |
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219 #endif /* USE_ASM_STRETCH */ |
| 0 | 220 const int bpp = dst->format->BytesPerPixel; |
| 221 | |
| 222 if ( src->format->BitsPerPixel != dst->format->BitsPerPixel ) { | |
| 223 SDL_SetError("Only works with same format surfaces"); | |
| 224 return(-1); | |
| 225 } | |
| 226 | |
| 227 /* Verify the blit rectangles */ | |
| 228 if ( srcrect ) { | |
| 229 if ( (srcrect->x < 0) || (srcrect->y < 0) || | |
| 230 ((srcrect->x+srcrect->w) > src->w) || | |
| 231 ((srcrect->y+srcrect->h) > src->h) ) { | |
| 232 SDL_SetError("Invalid source blit rectangle"); | |
| 233 return(-1); | |
| 234 } | |
| 235 } else { | |
| 236 full_src.x = 0; | |
| 237 full_src.y = 0; | |
| 238 full_src.w = src->w; | |
| 239 full_src.h = src->h; | |
| 240 srcrect = &full_src; | |
| 241 } | |
| 242 if ( dstrect ) { | |
| 243 if ( (dstrect->x < 0) || (dstrect->y < 0) || | |
| 244 ((dstrect->x+dstrect->w) > dst->w) || | |
| 245 ((dstrect->y+dstrect->h) > dst->h) ) { | |
| 246 SDL_SetError("Invalid destination blit rectangle"); | |
| 247 return(-1); | |
| 248 } | |
| 249 } else { | |
| 250 full_dst.x = 0; | |
| 251 full_dst.y = 0; | |
| 252 full_dst.w = dst->w; | |
| 253 full_dst.h = dst->h; | |
| 254 dstrect = &full_dst; | |
| 255 } | |
| 256 | |
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257 /* Lock the destination if it's in hardware */ |
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258 dst_locked = 0; |
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259 if ( SDL_MUSTLOCK(dst) ) { |
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260 if ( SDL_LockSurface(dst) < 0 ) { |
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261 SDL_SetError("Unable to lock destination surface"); |
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262 return(-1); |
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263 } |
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264 dst_locked = 1; |
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265 } |
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266 /* Lock the source if it's in hardware */ |
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267 src_locked = 0; |
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268 if ( SDL_MUSTLOCK(src) ) { |
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269 if ( SDL_LockSurface(src) < 0 ) { |
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270 if ( dst_locked ) { |
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271 SDL_UnlockSurface(dst); |
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272 } |
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273 SDL_SetError("Unable to lock source surface"); |
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274 return(-1); |
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275 } |
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276 src_locked = 1; |
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277 } |
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278 |
| 0 | 279 /* Set up the data... */ |
| 280 pos = 0x10000; | |
| 281 inc = (srcrect->h << 16) / dstrect->h; | |
| 282 src_row = srcrect->y; | |
| 283 dst_row = dstrect->y; | |
| 284 dst_width = dstrect->w*bpp; | |
| 285 | |
| 286 #ifdef USE_ASM_STRETCH | |
| 287 /* Write the opcodes for this stretch */ | |
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Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
Sam Lantinga <slouken@libsdl.org>
parents:
4108
diff
changeset
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288 if ( (bpp == 3) || |
| 0 | 289 (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0) ) { |
|
4109
cd2ab40f1219
Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
Sam Lantinga <slouken@libsdl.org>
parents:
4108
diff
changeset
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290 use_asm = SDL_FALSE; |
| 0 | 291 } |
| 292 #endif | |
| 293 | |
| 294 /* Perform the stretch blit */ | |
| 295 for ( dst_maxrow = dst_row+dstrect->h; dst_row<dst_maxrow; ++dst_row ) { | |
| 296 dstp = (Uint8 *)dst->pixels + (dst_row*dst->pitch) | |
| 297 + (dstrect->x*bpp); | |
| 298 while ( pos >= 0x10000L ) { | |
| 299 srcp = (Uint8 *)src->pixels + (src_row*src->pitch) | |
| 300 + (srcrect->x*bpp); | |
| 301 ++src_row; | |
| 302 pos -= 0x10000L; | |
| 303 } | |
| 304 #ifdef USE_ASM_STRETCH | |
|
4109
cd2ab40f1219
Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
Sam Lantinga <slouken@libsdl.org>
parents:
4108
diff
changeset
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305 if (use_asm) { |
| 0 | 306 #ifdef __GNUC__ |
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627
8b9ac38381d0
Fixed compile problem in SDL_stretch.c with gcc 3.3
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
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307 __asm__ __volatile__ ( |
|
1228
f4a3a4129d04
From Mike Frysinger and/or Gentoo:
Ryan C. Gordon <icculus@icculus.org>
parents:
1164
diff
changeset
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308 "call *%4" |
| 0 | 309 : "=&D" (u1), "=&S" (u2) |
|
1234
73676c1f56ee
For sanity's sake, removed the '&' when passing copy_row array to asm.
Ryan C. Gordon <icculus@icculus.org>
parents:
1233
diff
changeset
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310 : "0" (dstp), "1" (srcp), "r" (copy_row) |
| 0 | 311 : "memory" ); |
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1442
e3242177fe4a
Updated OS/2 build, yay!
Sam Lantinga <slouken@libsdl.org>
parents:
1402
diff
changeset
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312 #elif defined(_MSC_VER) || defined(__WATCOMC__) |
|
1234
73676c1f56ee
For sanity's sake, removed the '&' when passing copy_row array to asm.
Ryan C. Gordon <icculus@icculus.org>
parents:
1233
diff
changeset
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313 { void *code = copy_row; |
| 0 | 314 __asm { |
| 315 push edi | |
| 316 push esi | |
| 317 | |
| 318 mov edi, dstp | |
| 319 mov esi, srcp | |
| 320 call dword ptr code | |
| 321 | |
| 322 pop esi | |
| 323 pop edi | |
| 324 } | |
| 325 } | |
| 326 #else | |
| 327 #error Need inline assembly for this compiler | |
| 328 #endif | |
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4109
cd2ab40f1219
Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
Sam Lantinga <slouken@libsdl.org>
parents:
4108
diff
changeset
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329 } else |
|
cd2ab40f1219
Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
Sam Lantinga <slouken@libsdl.org>
parents:
4108
diff
changeset
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330 #endif |
| 0 | 331 switch (bpp) { |
| 332 case 1: | |
| 333 copy_row1(srcp, srcrect->w, dstp, dstrect->w); | |
| 334 break; | |
| 335 case 2: | |
| 336 copy_row2((Uint16 *)srcp, srcrect->w, | |
| 337 (Uint16 *)dstp, dstrect->w); | |
| 338 break; | |
| 339 case 3: | |
| 340 copy_row3(srcp, srcrect->w, dstp, dstrect->w); | |
| 341 break; | |
| 342 case 4: | |
| 343 copy_row4((Uint32 *)srcp, srcrect->w, | |
| 344 (Uint32 *)dstp, dstrect->w); | |
| 345 break; | |
| 346 } | |
| 347 pos += inc; | |
| 348 } | |
|
894
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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349 |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
350 /* We need to unlock the surfaces if they're locked */ |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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351 if ( dst_locked ) { |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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352 SDL_UnlockSurface(dst); |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
353 } |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
354 if ( src_locked ) { |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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355 SDL_UnlockSurface(src); |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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356 } |
| 0 | 357 return(0); |
| 358 } | |
| 359 |